JP2019533208A - Signal transmission method, active stylus pen, signal reception method, and touch panel - Google Patents

Abstract

The present application relates to a technical field of signal processing, and provides a signal transmission method, an active stylus pen, a signal reception method, and a touch panel. The signal transmission method includes performing amplitude modulation on n binary codes (n is an integer greater than 1) representing information to be transmitted to obtain n code amplitude modulated signals arranged in order, N code amplitude modulation signals arranged in order are continuously transmitted, a code amplitude modulation signal having an odd array number is transmitted at a preset first frequency, and a code amplitude modulation signal having an even array number At a preset second frequency. The present application eliminates the fault-tolerant time between the code amplitude modulation signals by continuously transmitting n code amplitude modulation signals at the first frequency and the second frequency which are alternated, and the same number of code amplitude modulation signals. The transmission time is shortened, and accordingly, the time necessary for the panel side to complete the detection of the code amplitude modulation signal is shortened, thereby improving the report rate and improving the interference resistance capability of the touch panel. [Selection] Figure 5

Description

  The present application relates to the technical field of signal processing, and more particularly to a signal transmission method, an active stylus pen, a signal reception method, and a touch panel.

  With the proliferation of capacitive touch panels, the application of capacitive active stylus pens has become increasingly widespread. When the user uses a capacitive active stylus pen, the capacitive touch panel detects the coded signal of the panel body and the coded signal of the active stylus pen in a time-sharing manner, and the panel body detection time of the capacitive touch panel is This is an important factor affecting the report rate of the active stylus pen. The higher the report rate, the faster the response of the active stylus pen on the panel body to writing. As the user's demand for the writing experience and touch experience of the active stylus pen improves, the demand for the report rate of the active stylus pen also increases.

  The inventor has found that the following problems exist in the prior art. In the conventional encoding method, as shown in FIG. 1, when an active stylus pen transmits a signal, a signal of each bit (bit) detected by the panel side is detected due to a synchronization problem between the pen side and the panel side. In order to ensure that they do not affect each other, it is necessary to leave a fault tolerant time t between each bit, so that the detection time of the panel body of the touch panel occupied by the active stylus pen is long, and the report of the active stylus pen It affects the rate and the interference resistance of the panel body is weak.

  Some embodiments of the present application aim to provide a signal transmission method, an active stylus pen, a signal reception method, and a touch panel. In this case, n code amplitude modulation signals are continuously generated at alternating first and second frequencies. Transmission eliminates the fault-tolerant time between each code amplitude modulation signal, shortens the transmission time of the same number of code amplitude modulation signals, and is necessary for the panel side to complete the detection of the code amplitude modulation signal. Saving time, thereby improving the report rate and improving the interference resistance of the touch panel.

  The embodiments of the present application provide a signal transmission method, which is applied to an active stylus pen. The method performs amplitude modulation on n binary codes (n is an integer greater than 1) each representing information to be transmitted. A step of obtaining n code amplitude modulation signals arranged in sequence, and sequentially transmitting n code amplitude modulation signals arranged in sequence, and a code amplitude modulation signal having an odd arrangement number is preset. Transmitting at a first frequency and transmitting a code amplitude modulation signal having an even array element number at a second frequency set in advance.

  The embodiments of the present application further provide a signal receiving method, which is applied to a touch panel, which uses n + 1 detection time slices to continuously transmit n code amplitude modulated signals continuously transmitted by an active stylus pen. Among the n code amplitude modulation signals, the code amplitude modulation signal having an odd array number has a preset first frequency and the code amplitude modulation signal having an even array number Has a preset second frequency, and the signals detected in the i th (i = 1, 2, 3... N) number of detection time slices and the (i + 1) th detection time slice are complete first. a step including i code amplitude modulation signals; calculating a signal strength of n code amplitude modulation signals based on signals detected in n + 1 detection time slices; And each binarizing the signal strength of the pieces of code amplitude modulated signal, comprising the steps of obtaining n pieces binary code representing the information of the transmission target, the.

  Embodiments of the present application further provide an active stylus pen, comprising: at least one processor; and a memory communicatively coupled to the at least one processor, wherein the instructions store instructions executable by the at least one processor; The instructions are executed by at least one processor, so that at least one processor can execute the signal transmission method.

  Embodiments of the present application further provide a touch panel, comprising: at least one processor; and a memory that is communicatively connected to the at least one processor, the memory storing instructions executable by the at least one processor; When executed by at least one processor, the at least one processor can perform the signal receiving method.

  In the embodiment of the present application, the active stylus pen performs amplitude modulation on each of n binary codes representing information to be transmitted, and alternates n code amplitude modulation signals as compared with the prior art. By continuously transmitting at the frequency and the second frequency, the fault tolerant time between the code amplitude modulation signals is eliminated, and the transmission time of the same number of code amplitude modulation signals is shortened. When the time required to complete detection is shortened, thereby improving the report rate, improving the interference resistance of the touch panel, and when the touch panel detects each code amplitude modulation signal transmitted continuously One complete code amplitude modulated signal can be collected and distinguished in two adjacent detection time slices, so detection is dependent As it is accurate.

  In the signal transmission method, the first frequency and the second frequency are both integer multiples of the base frequency, and the modulus of the difference between the first frequency and the second frequency is twice or more the base frequency. In this embodiment, a specific setting method for the first frequency and the second frequency is provided, and the mutual influence between the first frequency and the second frequency can be avoided.

  In the signal transmission method, the time slice length of each code amplitude modulated signal is the same. In this embodiment, by setting the time slice length of each code amplitude modulation signal to be the same, it is possible to reduce the transmission complexity of the code amplitude modulation signal and the complexity of the panel side detection. .

  In the signal transmission method, when the binary code is zero, the code amplitude modulation signal is zero. In the present embodiment, when the binary code is zero, no signal is transmitted in the time slice, and a simple processing method of a signal having a binary code of zero is provided.

  In the signal transmission method, the information to be transmitted includes the pen tip pressure of the active stylus pen or the function key press signal of the active stylus pen. This embodiment provides specific contents of information to be transmitted.

  In the signal reception method, the time slice length of the i th detection time slice is equal to the time slice length of the i th code amplitude modulation signal, and the time slice length of the n + 1 th detection time slice is the first n time slice lengths. Is equal to one of the time slice lengths of the detected time slices. In this embodiment, a specific method for setting the time slice length of n + 1 detection time slices is provided.

  In the signal reception method, the time slice length of the (n + 1) th detection time slice is equal to the minimum time slice length among the time slice lengths of the first n detection time slices. In this embodiment, the detection time of the touch panel can be further shortened.

  In the signal reception method, the time slice lengths of the code amplitude modulation signals are the same. In this embodiment, it is possible to reduce the transmission complexity of the code amplitude modulation signal and reduce the complexity of the panel side detection.

  In the signal reception method, the signal strength Biti of the i-th code amplitude modulation signal is Bti = Ri_f1 + Ri + 1_f1 when n is an even number and i is an odd number, and Biti = Ri_f2 + Ri + 1_f2 when i is an even number. Where Ri_f1 represents the signal strength of the code amplitude modulated signal having the first frequency in the i th detection time slice, and Ri_f2 represents the code amplitude modulated signal having the second frequency in the i th detection time slice. Ri + 1_f1 indicates the signal strength of the code amplitude modulation signal having the first frequency in the (i + 1) th detection time slice, and Ri + 1_f2 indicates the signal strength of the code amplitude modulation signal having the second frequency in the (i + 1) th detection time slice. Indicates the signal strength. This embodiment provides a specific calculation formula for the signal strength of the code amplitude modulation signal.

One or more embodiments are illustratively described with reference to the corresponding drawings, which are not intended to limit the embodiments, and elements with the same reference numerals in the drawings are similar elements, particularly Unless explained, the drawings do not limit proportion.
It is a schematic diagram which shows the signal transmission of the active stylus pen of a prior art. It is a structure schematic diagram which shows communication with the active stylus pen and touch panel which concern on 1st Example of this application. It is a schematic diagram which shows the signal transmission of the active stylus pen which concerns on 1st Example of this application. It is a flowchart which shows the signal transmission method which concerns on 1st Example of this application. It is a schematic diagram which shows an example of signal transmission and panel side detection of the active stylus pen concerning 2nd Example of this application. It is a schematic diagram which shows another example of the signal transmission and panel side detection of the active stylus pen which concerns on 2nd Example of this application. It is a flowchart which shows the signal reception method which concerns on 2nd Example of this application.

  In order to clarify the objects, technical solutions, and advantages of the present application, some embodiments of the present application will be described in more detail below with reference to the drawings and embodiments. Of course, the specific embodiments described herein are merely for interpreting the present application and do not limit the present application.

  The first embodiment of the present application relates to a signal transmission method, and is applied to an active stylus pen. The signal transmission method performs amplitude modulation on each of n binary codes (n is an integer greater than 1) binary codes representing information to be transmitted. To obtain n code amplitude modulation signals arranged in order, and sequentially transmit the n code amplitude modulation signals arranged in order, so that a code amplitude modulation signal having an odd array number is preliminarily transmitted. Transmitting at a set first frequency and transmitting a code amplitude modulation signal having an even array element number at a preset second frequency.

  In the present embodiment, compared to the prior art, the active stylus pen performs amplitude modulation on n binary codes representing information to be transmitted, and the n code amplitude modulation signals are alternately switched to the first frequency. By transmitting continuously at the second frequency, the fault tolerant time between each code amplitude modulation signal is eliminated, and the transmission time of the same number of code amplitude modulation signals is shortened, and the panel side detects the code amplitude modulation signal accordingly. Reduce the time required to complete the report, thereby improving the report rate and improving the interference resistance of the panel body, and the touch panel detects each code amplitude modulated signal transmitted continuously Can collect and distinguish one complete code amplitude modulated signal in two adjacent detection time slices, so detection remains It is accurate.

  Hereinafter, the implementation details of the signal transmission method of the present embodiment will be specifically described, and the following content is only implementation details provided for easy understanding, and is necessary for implementing the present solution. is not.

  The signal transmission method of the present embodiment is applied to an active stylus pen, the active stylus pen communicates with the touch panel, and FIG. 2 is a schematic diagram showing communication between the active stylus pen and the touch panel. The active stylus pen may be a capacitive active stylus pen.

  Hereinafter, first, a communication method between the active stylus pen and the touch panel will be described.

  The touch panel includes an induction layer 11, a touch controller 12, and a multiplexer 13. The induction layer 11 includes a drive channel Y and an induction channel X. The drive channel Y and the induction channel X are connected to the touch controller 12 via the multiplexer 13. The touch controller 12 further includes an induction circuit 121 and a drive circuit 122. At the panel side detection timing of the touch panel, within one cycle T, the panel side completes mutual capacitance detection, noise detection, and active stylus pen signal detection in order. Side report rate.

  When the active stylus pen signal is detected, the touch controller 12 controls the drive channel Y and the guide channel X through the multiplexer 13 to connect to the guide circuit 121, and the pen tip of the active stylus pen 100 transmits a signal to the touch panel. , There is a coupling capacitance between the active stylus pen 100 and the driving channel Y and the induction channel X, a signal is coupled to the driving channel Y and the induction channel X by the coupling capacitance, and a signal is detected by the induction circuit 121, and a detection process The touch panel receives a signal but does not transmit a signal. The signal transmitted from the pen tip of the active stylus pen 100 may be a square wave, a sine wave, a triangular wave, or the like.

  FIG. 3 is a schematic diagram showing signal transmission and panel side detection of the active stylus pen. The signal transmission of the active stylus pen 100 includes a first stage in which the pen tip transmits a Beacon beacon signal to realize timing synchronization with the touch panel, and n binary codes in which the pen tip represents information to be transmitted are continuously transmitted. And the second stage of transmitting to

A specific process of the signal transmission method of this embodiment is shown in FIG. The first stage of signal transmission of the active stylus pen 100 is the same as the prior art, and is to transmit a Beacom beacon signal. This embodiment is improved in the second stage of signal transmission. Specifically,
Step 101: Each of n binary codes representing information to be transmitted is subjected to amplitude modulation to obtain n code amplitude modulated signals arranged in order.

  Specifically, the active stylus pen 100 first performs amplitude modulation on n binary codes representing information to be transmitted to obtain n code amplitude modulated signals arranged in order. As for a specific amplitude modulation method, a signal amplitude having a binary code of 1 is modulated to a first amplitude, a signal amplitude having a binary code of 0 is modulated to a second amplitude, and the first amplitude is greater than the second amplitude. Large, preferably, the second amplitude is zero, ie, the signal amplitude where the binary code is zero is modulated to zero, and at this time, the active stylus pen 100 has a code amplitude modulation signal in the time slice where the binary code is zero. Is provided, and a simple processing method of a signal whose binary code is 0 is provided. A time slice of a binary code is a time slice of a code amplitude modulation signal corresponding to the binary code, and refers to a transmission period to which a code amplitude modulation signal corresponding to each binary code is assigned. The active stylus pen 100 transmits each transmission period. A corresponding code amplitude modulation signal is transmitted. The information on the transmission target may be the pressure of the pen tip of the active stylus pen 100 or the function key pressing signal of the active stylus pen 100. The pressure of the pen tip is measured by a member such as a pressure sensor, and the transmission target is measured. Information is encoded and transmitted to the panel side, and the function key pressing signal is processed in the same manner. When the function key is pressed, information on the transmission target corresponding to the function is generated (obtaining information on the transmission target). Therefore, some signal processing may be performed) and then encoded and transmitted to the panel side.

  Step 102 sequentially transmits n code amplitude modulation signals arranged in order, and transmits a code amplitude modulation signal having an odd array element number at a preset first frequency, and a code having an even array element number An amplitude modulation signal is transmitted at a preset second frequency.

  Specifically, in the active stylus pen 100, two types of transmission frequencies of the first frequency f1 and the second frequency f2 are preset, and n code amplitude modulation signals are continuously transmitted and arranged. A code amplitude modulation signal having an odd number is transmitted at the first frequency f1, and a code amplitude modulation signal having an even number is transmitted at the second frequency f2. In the example shown in FIG. 4, eight code amplitude modulation signals are included (that is, eight binary codes represent information of one transmission target), and the active stylus pen converts the eight code amplitude modulation signals into its code amplitude modulation signals. In accordance with the arrangement order, the first frequency f1 and the second frequency f2 that are alternately transmitted are continuously transmitted, and the first, third, fifth, and seventh code amplitude modulation signals are the first frequency as shown in the figure. f1, and the second, fourth, sixth, and eighth code amplitude modulated signals have a second frequency f2. Although the number of code amplitude modulation signals is exemplarily shown in FIG. 4, this embodiment does not limit the specific number of code amplitude modulation signals.

  In this embodiment, the first frequency and the second frequency are integer multiples of the base frequency, and the modulus of the difference between the first frequency and the second frequency is at least twice the base frequency, and the base frequency is code amplitude modulation. It is the reciprocal of the time slice length of the time slice of the signal. Preferably, the time slice length of each code amplitude modulated signal is the same, that is, the transmission duration of the code amplitude modulated signal corresponding to each binary code is the same, for example, the time slice length of each code amplitude modulated signal is 100 us, the corresponding base frequency is 10 KHz, the first frequency and the second frequency are selected as integer multiples of 10 KHz, for example, the first frequency and the second frequency are 20 KHz and 40 KHz, respectively. By setting the modulus of the difference between the first frequency and the second frequency to be twice or more the base frequency, it is possible to avoid the mutual influence between the first frequency and the second frequency.

  By setting the time slice length of each code amplitude modulated signal to be the same, it is possible to reduce the transmission complexity of the pen side code amplitude modulated signal and the panel side detection complexity.

  However, the present embodiment does not limit the setting of the time slice length of each code amplitude modulation signal. For example, the time slice length of each code amplitude modulation signal transmitted at the same frequency is the same and at different frequencies. The time slice length of each code amplitude modulation signal to be transmitted may be set not to be the same, and the time slice length of each code amplitude modulation signal is not the same or the time of some code amplitude modulation signals The slice length may be set to be the same. When the time slice lengths of the code amplitude modulation signals are not the same, the reciprocal of the minimum time slice length is set as the base frequency.

  The second embodiment of the present application relates to a signal receiving method, and is applied to a touch panel. In the active stylus pen signal detection stage of the touch panel, the code amplitude modulation transmitted by the active stylus pen based on the signal transmitting method described in the first embodiment. Detect the signal.

  As shown in FIGS. 5 and 6, when the touch panel detects a Beacon signal in the active stylus pen signal detection stage, it first detects three time slices (X TFO / X / Y), and then the X TFO time slice. Calculates the synchronization error adjustment time et, and the X / Y time slice calculates the nib coordinates. The panel side adjusts the delay T1 based on the calculated adjustment time et, adjusts the code detection start time, and sets the synchronization error erro between the panel side and the pen side within an allowable range, thereby allowing the pen tip Ensures that all of the n binary codes transmitted continuously can be detected. The code detection synchronization error erro needs to be controlled to be half of the minimum time slice length of the time slice length of each code amplitude modulation signal. For example, when the minimum time slice length is 100 us, the code detection synchronization error Needs to be controlled within 50 us.

  When the code detection start time is determined, the signal receiving method of this embodiment is started, and a specific process is shown in FIG.

  Step 201: Using the n + 1 detection time slices, n code amplitude modulation signals continuously transmitted by the active stylus pen are continuously detected.

  Specifically, n code amplitude modulation signals continuously transmitted by the active stylus pen 100 are continuously detected from the start point of code detection using n + 1 detection time slices. Among the n code amplitude modulation signals transmitted by the active stylus pen 100, the code amplitude modulation signal whose array number is an odd number has a preset first frequency f1, and the code amplitude modulation signal whose array number is an even number. Has a preset second frequency f2 different from the first frequency.

  When the active stylus pen 100 transmits n code amplitude modulation signals, there is a possibility that there is a transmission advance or delay. Therefore, in order for the panel side to ensure complete reception of each code amplitude modulation signal, each code The reception window corresponding to the amplitude modulation signal needs to be larger than the time slice length of the code amplitude modulation signal, and it is necessary to leave a time of one synchronization error erro before and after. Therefore, two adjacent detection time slices are used as a detection window for one code amplitude modulation signal, i.e., the i (i = 1, 2, 3,... N) detection time slices and the (i + 1) th detection time. It is necessary to satisfy that the signal detected in the slice includes the complete i-th code amplitude modulation signal. Alternatively, two adjacent detection time slices (i th detection time slice and i + 1 th detection time slice) are required to complete the detection of the i th code amplitude modulation signal.

  In each detection time slice of the panel side detection, the time slice length of the i-th (i = 1, 2, 3... N) detection time slice is equal to the time slice length of the i-th code amplitude modulation signal, and the (n + 1) th. It is necessary to satisfy the condition that the time slice length of each detected time slice is equal to one time slice length among the time slice lengths of the first n detected time slices. Preferably, the time slice length of the (n + 1) th detection time slice is equal to the minimum time slice length of the time slice lengths of the first n detection time slices, thereby further reducing the detection time of the touch panel. it can.

  In the present embodiment, the active stylus pen 100 continuously transmits n code amplitude modulation signals at the first frequency f1 and the second frequency f2, which are alternately alternated, and the same (one) detection time at the panel side detection. Since two adjacent code amplitude modulation signals in a slice can be detected simultaneously, and the transmission frequency of the two adjacent code amplitude modulation signals is different, the panel side still distinguishes between the two code amplitude modulation signals in each detection time slice So that n code amplitude modulated signals can be accurately detected.

  In one example, as shown in FIG. 5, the active stylus pen 100 continuously transmits eight code amplitude modulation signals at the first frequency f1 and the second frequency f2, which are alternately alternated, and the first frequency f1 and the second frequency f2 respectively. The time slice lengths of the code amplitude modulation signals are the same and are 100 us. In this case, the synchronization error erro is half the minimum time slice length of the time slice lengths of the code amplitude modulation signals and is 50 us. At the time of panel side detection, continuous detection of eight code amplitude modulation signals is completed using nine detection time slices (R1 to R9). The time slice length of the i-th detection time slice is equal to the time slice length of the i-th code amplitude modulation signal, and the time slice lengths of the code amplitude modulation signals of the first frequency f1 and the second frequency f2 are both 100 us. Therefore, since the time slice lengths of the first eight detection time slices are all 100 us and the time slice lengths of the respective code amplitude modulation signals are all 100 us, the time slice length of the ninth detection time slice is It is the same as the time slice length of each code amplitude modulation signal and is 100 us.

  In another example, as shown in FIG. 6, the active stylus pen 100 continuously transmits eight code amplitude modulation signals at the first frequency f1 and the second frequency f2 that alternate, and the code amplitude of the first frequency f1. The time slice lengths of the modulated signals are all the same, 100 us, the time slice lengths of the code amplitude modulated signals of the second frequency f2 are the same, 200 us, and the synchronization error is the time slice of each code amplitude modulated signal. Half of the minimum time slice length of the length, 50 us. During the panel side detection, the continuous detection of the eight code amplitude modulation signals is completed using the nine detection time slices (R1 to R9), and the time slice length of the i-th detection time slice is the i-th time slice length. Since it is equal to the time slice length of the code amplitude modulation signal, the time slice lengths of the detection time slices R1, R3, R5, R7 are all 100 us, and the time slice lengths of the detection time slices R2, R4, R6, R8 are all The time slice length of the (n + 1) th detection time slice is equal to one of the time slice lengths of the first n detection time slices, that is, the time slice length of the detection time slice R9 is 100 us or 200 us, preferably the detection time slice R9 Im slice length is 100us (in the figure, this is an example).

  5 illustrates as an example that the time slice lengths of the code amplitude modulation signals are the same, and FIG. 6 illustrates that the time slice lengths of the code amplitude modulation signals of the same frequency are the same. Although it has been described as an example that the time slice lengths of the code amplitude modulation signals of different frequencies are not the same, the time slice length of each code amplitude modulation signal may not be the same, Several code amplitude modulation signals may have the same time slice length, and each detection time slice only needs to satisfy the above condition.

  Step 202: Calculate signal strengths of n code amplitude modulation signals based on signals detected in n + 1 detection time slices.

Specifically, since the i th code amplitude modulated signal is detected in the i th detection time slice and the i + 1 th detection time slice, the i th detection time slice and the i + 1 th detection time slice are detected. Based on the above, it is necessary to calculate the signal strength of the i-th code amplitude modulation signal. The signal strength Biti of the i-th code amplitude modulation signal is
If i is an odd number, Biti = Ri_f1 + Ri + 1_f1,
If i is an even number, Biti = Ri_f2 + Ri + 1_f2,
Ri_f1 indicates the signal strength of the code amplitude modulation signal having the first frequency in the i th detection time slice, and Ri_f2 indicates the signal strength of the code amplitude modulation signal having the second frequency in the i th detection time slice. Ri + 1_f1 indicates the signal strength of the code amplitude modulation signal having the first frequency in the (i + 1) th detection time slice, and Ri + 1_f2 indicates the signal strength of the code amplitude modulation signal having the second frequency in the (i + 1) th detection time slice. Hereinafter, this will be described in detail with reference to FIG. 5 or FIG.

The signal intensity Bit1 of the first code amplitude modulation signal is Bit1 = R1_f1 + R2_f1,
The signal intensity Bit2 of the second code amplitude modulation signal is Bit2 = R2_f2 + R3_f2,
The signal intensity Bit3 of the third code amplitude modulation signal is Bit3 = R3_f1 + R4_f1,
The signal intensity Bit4 of the fourth code amplitude modulation signal is Bit4 = R4_f2 + R5_f2,
The signal intensity Bit5 of the fifth code amplitude modulation signal is Bit5 = R5_f1 + R6_f1,
The signal intensity Bit6 of the sixth code amplitude modulation signal is Bit6 = R6_f2 + R7_f2,
The signal intensity Bit7 of the seventh code amplitude modulation signal is Bit7 = R7_f1 + R8_f1,
The signal intensity Bit8 of the eighth code amplitude modulation signal is Bit8 = R8_f2 + R9_f2.

  Step 203: The signal intensity of each of the n code amplitude modulation signals is binarized to obtain n binary codes representing information to be transmitted.

  Specifically, a first threshold value and a second threshold value are set in advance in the touch panel, and the first threshold value is larger than the second threshold value. The touch panel sets the calculated signal strengths of the n code amplitude modulation signals to the first value. Compared with the threshold value and the second threshold value, among the n code amplitude modulated signals, the code amplitude modulated signal whose signal strength is smaller than the second threshold value is set to 1, and the code amplitude modulated signal whose signal strength is smaller than the second threshold value. N binary codes representing information to be transmitted transmitted by the active stylus pen 100 are obtained.

  In the present embodiment, compared to the prior art, the active stylus pen performs amplitude modulation on n binary codes representing information to be transmitted, and the n code amplitude modulation signals are alternately switched to the first frequency. By transmitting continuously at the second frequency, the fault tolerant time between each code amplitude modulation signal is eliminated, and the transmission time of the same number of code amplitude modulation signals is shortened, and the panel side detects the code amplitude modulation signal accordingly. If the touch panel detects each code amplitude modulated signal transmitted continuously, the report rate is increased and the interference resistance of the touch panel is improved. One complete code amplitude modulated signal can be collected and distinguished in two adjacent detection time slices, so detection is still Te is accurate.

  The third embodiment of the present application relates to an active stylus pen, and includes at least one processor and a memory that is communicatively connected to the at least one processor, in which instructions executable by the at least one processor are stored. Is executed by at least one processor, the at least one processor can execute the signal transmission method of the first embodiment.

  In the present embodiment, compared to the prior art, the active stylus pen performs amplitude modulation on n binary codes representing information to be transmitted, and the n code amplitude modulation signals are alternately switched to the first frequency. By transmitting continuously at the second frequency, the fault tolerant time between each code amplitude modulation signal is eliminated, and the transmission time of the same number of code amplitude modulation signals is shortened, and the panel side detects the code amplitude modulation signal accordingly. If the touch panel detects each code amplitude modulated signal transmitted continuously, the report rate is increased and the interference resistance of the touch panel is improved. One complete code amplitude modulated signal can be collected and distinguished in two adjacent detection time slices, so detection is still Te is accurate.

  The fourth embodiment of the present application relates to a touch panel, and includes at least one processor and a memory that is communicatively connected to the at least one processor. The memory stores instructions that can be executed by the at least one processor. By being executed by one processor, at least one processor can execute the signal receiving method of the second embodiment.

  In the present embodiment, compared to the prior art, the active stylus pen performs amplitude modulation on n binary codes representing information to be transmitted, and the n code amplitude modulation signals are alternately switched to the first frequency. By transmitting continuously at the second frequency, the fault tolerant time between each code amplitude modulation signal is eliminated, and the transmission time of the same number of code amplitude modulation signals is shortened, and the panel side detects the code amplitude modulation signal accordingly. If the touch panel detects each code amplitude modulated signal transmitted continuously, the report rate is increased and the interference resistance of the touch panel is improved. One complete code amplitude modulated signal can be collected and distinguished in two adjacent detection time slices, so detection remains Te is accurate.

  Those skilled in the art will be able to make various changes in form and details in the actual application without departing from the spirit and scope of the present application. I can understand.

Claims (12)

A signal transmission method applied to an active stylus pen, the method comprising:
Performing amplitude modulation on each of n binary codes (n is an integer greater than 1) representing information to be transmitted to obtain n code amplitude modulated signals arranged in sequence;
The n code amplitude modulation signals arranged in sequence are continuously transmitted, the code amplitude modulation signal having an odd array number is transmitted at a preset first frequency, and the code having an even array number Transmitting an amplitude-modulated signal at a preset second frequency.   Each of the first frequency and the second frequency is an integral multiple of a base frequency, and a modulus of a difference between the first frequency and the second frequency is two times or more of the base frequency. The signal transmission method according to claim 1.   2. The signal transmission method according to claim 1, wherein the time slice lengths of the code amplitude modulation signals are the same.   The signal transmission method according to claim 1, wherein when the binary code is zero, the code amplitude modulation signal is zero.   The signal transmission method according to claim 1, wherein the information to be transmitted includes a pen tip pressure of the active stylus pen or a function key pressing signal of the active stylus pen. A signal receiving method applied to a touch panel, the method comprising:
Using the n + 1 detection time slices, the n code amplitude modulation signals continuously transmitted by the active stylus pen are continuously detected, and among the n code amplitude modulation signals, the array element number is an odd number. The code amplitude modulation signal having a first frequency set in advance and the code amplitude modulation signal having an even number of array numbers have a second frequency set in advance, i (i = 1, 2, 3... N) the signals detected in the i + 1 th detection time slice and the i + 1 th detection time slice include the complete i th code amplitude modulated signal;
calculating signal strengths of the n code amplitude modulation signals based on the signals detected in the n + 1 detection time slices;
binarizing the signal intensity of each of the n code amplitude modulation signals to obtain n binary codes representing information to be transmitted, and a signal receiving method comprising:   The time slice length of the i th detection time slice is equal to the time slice length of the i th code amplitude modulation signal, and the time slice length of the n + 1 th detection time slice is the first n detection times. The signal receiving method according to claim 6, wherein the time slice length is equal to one of the time slice lengths of the slices.   8. The signal receiving method according to claim 7, wherein a time slice length of the (n + 1) th detection time slice is equal to a minimum time slice length among the time slice lengths of the first n detection time slices.   9. The signal receiving method according to claim 6, wherein the time slice lengths of the code amplitude modulation signals are the same. The signal strength Biti of the i-th code amplitude modulation signal is:
If i is an odd number, Biti = Ri_f1 + Ri + 1_f1,
If i is an even number, Biti = Ri_f2 + Ri + 1_f2,
Where Ri_f1 indicates the signal strength of the code amplitude modulated signal having the first frequency in the i th detection time slice, and Ri_f2 indicates the code amplitude having the second frequency in the i th detection time slice. Ri + 1_f1 indicates the signal strength of the code amplitude modulation signal having the first frequency in the (i + 1) th detection time slice, and Ri + 1_f2 indicates the second signal strength in the (i + 1) th detection time slice. The signal receiving method according to claim 6, wherein a signal strength of the code amplitude modulation signal having a frequency is indicated. An active stylus pen,
At least one processor;
A memory in communication connection with the at least one processor,
The instruction executable by the at least one processor is stored in the memory, and the at least one processor is according to any one of claims 1 to 5 by the instruction being executed by the at least one processor. An active stylus pen capable of executing a signal transmission method. A touch panel,
At least one processor;
A memory in communication with the at least one processor,
11. The signal reception according to claim 6, wherein instructions executable by the at least one processor are stored in the memory, the instructions are executed by the at least one processor, and the at least one processor receives the signal according to claim 6. A touch panel characterized in that the method can be executed.